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Achyut ranjan gogoi
Softness roughly refers to the polarizability of an acid or base. The larger and more neutral any species, the softer it is. Read these links : https://chem.libretexts.org/Courses/Saint_Marys_College_Notre_Dame_IN/CHEM_342%3A_Bio-inorganic_Chemistry/Readings/Week_3%3A_Metal-Ligand_Interactions_continued..../3.2%3A_The_identity_of_metal_ion_and_the_ligand_donor_atom(s)_affects_affinity/3.2.1%3A_Hard_and_Soft_Acid_and_Base_Theory https://chem.libretexts.org/Bookshelves/Inorganic_Chemistry/Modules_and_Websites_(Inorganic_Chemistry)/Coordination_Chemistry/Complex_Ion_Equilibria/Hard_and_Soft_Acids_and_Bases